On top of that you could use fingerprint tech and voice recognition to access it. It would be a convenient way to carry and spend your coins in different places.

This is already happening somewhere in the part of the world , China or Korea maybe. A refugee camp has decided to cut food laundering act by officials and so it gave all the refuge come sort of crypto currency which could be use to buy things in stores located in several places in the camp. And they scan their eyes and tumb to pay . That’s the future I see, that’s what I see crypto becoming